Add 6.0.9 landing page

R1/source/releases/rel6.0.9.rst

+.. _rel6.0.9:
+
+Varnish Cache 6.0.9
+===================
+
+* Source download :download:`varnish-6.0.9.tgz <varnish-6.0.9.tgz>`
+
+* SHA256=507314583834abc0a733813d99a7b90613cb531708486e9e32b0033699e717bc
+
+* This release in the 6.0 LTS brach contains several bug fixes. More
+  information is available in the changelog.
+
+More information:
+
+* `changes.rst entry for 6.0.9 <https://github.com/varnishcache/varnish-cache/blob/6.0/doc/changes.rst#varnish-cache-609-2021-11-24>`_
+
+* `List of changes and other good reasons to update to 6.0 </docs/6.0/whats-new/changes-6.0.html>`_
+
+* `Upgrading </docs/6.0/whats-new/upgrading-6.0.html>`_
+
+For installation instructions including information about cloud images see
+`the Varnish Installation Manual </docs/trunk/installation/index.html>`_